:For the community in Saxony, Germany, see Radibor.
Other achievements of Thomas II include the consecration of the high altar of the cathedral, attendance at the First Council of Lyon (1274), holding a diocesan synod in 1279 and the establishment of the St. Thomas Collegiate Church in Racibórz.
In 1336, Jan was forced to accept the annexation of the Duchy of Racibórz to the Přemyslid Duchy of Opawa.
Joseph Franz Schacht, born in Ratibor, 15 March 1902, died in Englewood, 1 August 1969, was a British-German professor of Arabic and Islam at Columbia University in New York.
After his death, as a result of the arbitrary decision of King John of Bohemia (and despite the strong resistance of the other Piast rulers in Upper Silesia who were their closest male relatives), the Duchy of Racibórz was given to Duke Nicholas II of Opawa, who claimed the rights of his wife Anna, Leszek's oldest sister.
It is located on Rybnik Plateau (Płaskowyż Rybnicki), in close vicinity to such cities, as Rybnik, Wodzisław Śląski, Racibórz, Radlin, Rydułtowy, Jastrzębie-Zdrój and Żory.
About 1269 the Duchy of Opava was established on adjacent Moravian territory, ruled by the Přemyslid duke Nicholas I, whose descendants inherited the Duchy of Racibórz in 1336.
What is more, shortly after receiving news of the Ottokar II's defeat and death, the Duke of Opole-Racibórz attacked Opawa, probably wishing to obtain it.
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At first, the Duke of Opole-Racibórz supported the Hungarians, supporting Bolesław V the Chaste in his attacks over Opawa and Głubczyce.